1 files changed, 117 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/derivations.hh b/third_party/nix/src/libstore/derivations.hh
new file mode 100644
index 0000000000..8e02c9bc57
--- /dev/null
+++ b/third_party/nix/src/libstore/derivations.hh
@@ -0,0 +1,117 @@
+#pragma once
+
+#include "types.hh"
+#include "hash.hh"
+#include "store-api.hh"
+
+#include <map>
+
+
+namespace nix {
+
+
+/* Extension of derivations in the Nix store. */
+const string drvExtension = ".drv";
+
+
+/* Abstract syntax of derivations. */
+
+struct DerivationOutput
+{
+    Path path;
+    string hashAlgo; /* hash used for expected hash computation */
+    string hash; /* expected hash, may be null */
+    DerivationOutput()
+    {
+    }
+    DerivationOutput(Path path, string hashAlgo, string hash)
+    {
+        this->path = path;
+        this->hashAlgo = hashAlgo;
+        this->hash = hash;
+    }
+    void parseHashInfo(bool & recursive, Hash & hash) const;
+};
+
+typedef std::map<string, DerivationOutput> DerivationOutputs;
+
+/* For inputs that are sub-derivations, we specify exactly which
+   output IDs we are interested in. */
+typedef std::map<Path, StringSet> DerivationInputs;
+
+typedef std::map<string, string> StringPairs;
+
+struct BasicDerivation
+{
+    DerivationOutputs outputs; /* keyed on symbolic IDs */
+    PathSet inputSrcs; /* inputs that are sources */
+    string platform;
+    Path builder;
+    Strings args;
+    StringPairs env;
+
+    virtual ~BasicDerivation() { };
+
+    /* Return the path corresponding to the output identifier `id' in
+       the given derivation. */
+    Path findOutput(const string & id) const;
+
+    bool isBuiltin() const;
+
+    /* Return true iff this is a fixed-output derivation. */
+    bool isFixedOutput() const;
+
+    /* Return the output paths of a derivation. */
+    PathSet outputPaths() const;
+
+};
+
+struct Derivation : BasicDerivation
+{
+    DerivationInputs inputDrvs; /* inputs that are sub-derivations */
+
+    /* Print a derivation. */
+    std::string unparse() const;
+};
+
+
+class Store;
+
+
+/* Write a derivation to the Nix store, and return its path. */
+Path writeDerivation(ref<Store> store,
+    const Derivation & drv, const string & name, RepairFlag repair = NoRepair);
+
+/* Read a derivation from a file. */
+Derivation readDerivation(const Path & drvPath);
+
+/* Check whether a file name ends with the extension for
+   derivations. */
+bool isDerivation(const string & fileName);
+
+Hash hashDerivationModulo(Store & store, Derivation drv);
+
+/* Memoisation of hashDerivationModulo(). */
+typedef std::map<Path, Hash> DrvHashes;
+
+extern DrvHashes drvHashes; // FIXME: global, not thread-safe
+
+/* Split a string specifying a derivation and a set of outputs
+   (/nix/store/hash-foo!out1,out2,...) into the derivation path and
+   the outputs. */
+typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
+DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);
+
+Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs);
+
+bool wantOutput(const string & output, const std::set<string> & wanted);
+
+struct Source;
+struct Sink;
+
+Source & readDerivation(Source & in, Store & store, BasicDerivation & drv);
+Sink & operator << (Sink & out, const BasicDerivation & drv);
+
+std::string hashPlaceholder(const std::string & outputName);
+
+}